No, the SoJ must be an actual quantity that is owned by one of the participating members (duped, or legitimate).

40 PGems are worth anything from 2Os'd equipment, to the second highest rune, Cham.

Weirdly, trading away 30 PGems will not get you anywhere close to what you want as compared to acually having all 40 PGems, and you will get eternally laughed off of Battle.net if you did attempt to only use 30.